SSO bookmark on SSL VPN portal to login automatically?

I have configured bookmark on SSL VPN portal and would like to use SSO. Automatic doesn't work so I need to use Static. I have added username and password fields and values and it works so when I click the bookmark, I have login screen and my username & password filled but I need to press enter or click login button on that screen. Is it possible to have it logging in "automatically" as Automatic mode will do?